标题: | Microscopic Origin of the Giant Ferroelectric Polarization in Tetragonal-like BiFeO(3) |
作者: | Zhang, J. X. He, Q. Trassin, M. Luo, W. Yi, D. Rossell, M. D. Yu, P. You, L. Wang, C. H. Kuo, C. Y. Heron, J. T. Hu, Z. Zeches, R. J. Lin, H. J. Tanaka, A. Chen, C. T. Tjeng, L. H. Chu, Y-H. Ramesh, R. 材料科学与工程学系 Department of Materials Science and Engineering |
公开日期: | 29-九月-2011 |
摘要: | We report direct experimental evidence for a room-temperature, similar to 130 mu C/cm(2) ferroelectric polarization from the tetragonal-like BiFeO(3) phase. The physical origin of this remarkable enhancement of ferroelectric polarization has been investigated by a combination of x-ray absorption spectroscopy, scanning transmission electron microscopy, and first principles calculations. A large strain-induced Fe-ion displacement relative to the oxygen octahedra, combined with the contribution of Bi 6s lone pair electrons, is the mechanism driving the large ferroelectric polarization in this tetragonal-like phase. |
URI: | http://dx.doi.org/10.1103/PhysRevLett.107.147602 http://hdl.handle.net/11536/14786 |
ISSN: | 0031-9007 |
DOI: | 10.1103/PhysRevLett.107.147602 |
期刊: | PHYSICAL REVIEW LETTERS |
Volume: | 107 |
Issue: | 14 |
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显示于类别: | Articles |